package com.ajview.core.mybatisplus.interceptor;

import com.baomidou.mybatisplus.core.toolkit.CollectionUtils;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.executor.Executor;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.mapping.MappedStatement;
import org.apache.ibatis.mapping.ParameterMapping;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.reflection.MetaObject;
import org.apache.ibatis.session.Configuration;
import org.apache.ibatis.session.ResultHandler;
import org.apache.ibatis.session.RowBounds;
import org.apache.ibatis.type.TypeHandlerRegistry;

import java.text.DateFormat;
import java.util.Date;
import java.util.List;
import java.util.Locale;
import java.util.regex.Matcher;


/**
 * @author zhangjunjie
 * MyBatis拦截器打印不带问号的完整sql语句
 */
@Slf4j
@Intercepts(
        {
                @Signature(type = Executor.class, method = "update", args = {MappedStatement.class, Object.class}),
                @Signature(type = Executor.class, method = "query", args = {MappedStatement.class, Object.class, RowBounds.class, ResultHandler.class})
        }
)
public class MybatisSqlLoggerInterceptor implements Interceptor {
    /**
     * 进行？的替换
     */
    public static String showSql(Configuration configuration, BoundSql boundSql) {
        // 获取参数
        Object parameterObject = boundSql.getParameterObject();
        List<ParameterMapping> parameterMappings = boundSql.getParameterMappings();
        // sql语句中多个空格都用一个空格代替
        String sql = boundSql.getSql().replaceAll("[\\s]+", " ");
        if (CollectionUtils.isNotEmpty(parameterMappings) && parameterObject != null) {
            // 获取类型处理器注册器，类型处理器的功能是进行java类型和数据库类型的转换
            TypeHandlerRegistry typeHandlerRegistry = configuration.getTypeHandlerRegistry();
            // 如果根据parameterObject.getClass(）可以找到对应的类型，则替换
            if (typeHandlerRegistry.hasTypeHandler(parameterObject.getClass())) {
                sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(parameterObject)));
            } else {
                // MetaObject主要是封装了originalObject对象，提供了get和set的方法用于获取和设置originalObject的属性值,主要支持对JavaBean、Collection、Map三种类型对象的操作
                MetaObject metaObject = configuration.newMetaObject(parameterObject);
                for (ParameterMapping parameterMapping : parameterMappings) {
                    String propertyName = parameterMapping.getProperty();
                    if (metaObject.hasGetter(propertyName)) {
                        Object obj = metaObject.getValue(propertyName);
                        sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(obj)));
                    } else if (boundSql.hasAdditionalParameter(propertyName)) {
                        // 该分支是动态sql
                        Object obj = boundSql.getAdditionalParameter(propertyName);
                        sql = sql.replaceFirst("\\?", Matcher.quoteReplacement(getParameterValue(obj)));
                    } else {
                        // 未知参数，替换？防止错位
                        sql = sql.replaceFirst("\\?", "unknown");
                    }
                }
            }
        }
        return sql;
    }

    /**
     * 如果参数是String，则添加单引号
     * 如果参数是日期，则转换为时间格式器并加单引号； 对参数是null和不是null的情况作了处理
     */
    private static String getParameterValue(Object obj) {
        String value;
        if (obj instanceof String) {
            value = "'" + obj + "'";
        } else if (obj instanceof Date) {
            DateFormat formatter = DateFormat.getDateTimeInstance(DateFormat.DEFAULT, DateFormat.DEFAULT, Locale.CHINA);
            value = "'" + formatter.format(new Date()) + "'";
        } else {
            if (obj != null) {
                value = obj.toString();
            } else {
                value = "";
            }
        }
        return value;
    }

    @Override
    public Object intercept(Invocation invocation) throws Throwable {
        Object returnValue;

        Long startTime = System.currentTimeMillis();
        returnValue = invocation.proceed();
        Long endTime = System.currentTimeMillis();
        Long executeTime = endTime - startTime;

        try {
            // 获取xml中的一个select/update/insert/delete节点，是一条SQL语句
            MappedStatement mappedStatement = (MappedStatement) invocation.getArgs()[0];
            Object parameter = null;
            // 获取参数，if语句成立，表示sql语句有参数，参数格式是map形式
            if (invocation.getArgs().length > 1) {
                parameter = invocation.getArgs()[1];
            }
            // 获取到节点的id,即sql语句的id
            String id = mappedStatement.getId();
            // BoundSql就是封装myBatis最终产生的sql类
            BoundSql boundSql = mappedStatement.getBoundSql(parameter);
            // 获取节点的配置
            Configuration configuration = mappedStatement.getConfiguration();
            // 获取到最终的sql语句
            String sql = showSql(configuration, boundSql);
            log.debug("\n 调用接口: {} 对数据库进行操作 [\n\t{} \n] 耗时:\t{}ms", id, sql, executeTime);
        } catch (Exception e) {
            e.printStackTrace();
        }
        // 执行完上面的任务后，不改变原有的sql执行过程
        return returnValue;
    }

}
